Geoscience Reference
In-Depth Information
Notes
1. The DEM created using the spline with tension method with the parameters tension
=
40,
smooth
0.1(a); derived from this a grid of the slopes (b) where there are marked selected
places with undesirable surface unevenness arising due to erroneous interpolation. DEM cre-
ated using the spline with tension method with the parameters tension
=
0.8
(c); derived from this a grid of the slopes (d) where there are no errors visible “at first sight”.
However, for the final determination of the most suitable interpolation parameters it is always
necessary to perform statistical evaluation (e.g. an RMSE calculation) (source: Kadlcíková,
2007a)
2. For DEMs: it is possible to visually identify (a) a minimum (spline with tension method, weight
15, no. of points 30) and (b) a high (IDW method, power 2, no. of points 50) number of gross
errors (blunders). Hammock plots representing individual modules after division by5-red
mod0 (i.e. the remainder after the division is 0), violet mod1 and mod4, blue mod2 and mod3
in the form of surfaces (c-d) and in the form of histograms (e-f ) (source: the authors)
3. Grid DEM modelled by the spline with tension method. Setting for high-quality DEM is based
on Table 14.2; RAS: relative altitudinal segmentation; LCL: length of contour lines; W: weight;
NOP: number of points. (source: the authors)
=
20, smooth
=
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